// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

// A client sending requests to server in batch every 1 second.

#include <gflags/gflags.h>
#include <butil/logging.h>
#include <brpc/channel.h>
#include <brpc/stream.h>
#include "echo.pb.h"

DEFINE_bool(send_attachment, true, "Carry attachment along with requests");
DEFINE_string(connection_type, "", "Connection type. Available values: single, pooled, short");
DEFINE_string(server, "0.0.0.0:8001", "IP Address of server");
DEFINE_int32(timeout_ms, 1000 * 60 * 30, "RPC timeout in milliseconds");
DEFINE_int32(max_retry, 3, "Max retries(not including the first RPC)");
class Auth : public brpc::Authenticator
{
public:
    virtual ~Auth() {}

    // Implement this method to generate credential information
    // into `auth_str' which will be sent to `VerifyCredential'
    // at server side. This method will be called on client side.
    // Returns 0 on success, error code otherwise
    virtual int GenerateCredential(std::string *auth_str) const override
    {
        *auth_str = "username";
        return 0;
    };

    // Implement this method to verify credential information
    // `auth_str' from `client_addr'. You can fill credential
    // context (result) into `*out_ctx' and later fetch this
    // pointer from `Controller'.
    // Returns 0 on success, error code otherwise
    virtual int VerifyCredential(const std::string &auth_str,
                                 const butil::EndPoint &client_addr,
                                 brpc::AuthContext *out_ctx) const override
    {
        return -1;
    };
};

class StreamReceiver : public brpc::StreamInputHandler
{
public:
    virtual int on_received_messages(brpc::StreamId id,
                                     butil::IOBuf *const messages[],
                                     size_t size)
    {
        std::ostringstream os;
        for (size_t i = 0; i < size; ++i)
        {
            os << "msg[" << i << "]=" << *messages[i];
        }
        LOG(INFO) << "Received from Stream=" << id << ": " << os.str();
        return 0;
    }
    virtual void on_idle_timeout(brpc::StreamId id)
    {
        LOG(INFO) << "Stream=" << id << " has no data transmission for a while";
    }
    virtual void on_closed(brpc::StreamId id)
    {
        LOG(INFO) << "Stream=" << id << " is closed";
    }
};
StreamReceiver _receiver;
int main(int argc, char *argv[])
{
    // Parse gflags. We recommend you to use gflags as well.
    GFLAGS_NS::ParseCommandLineFlags(&argc, &argv, true);

    // A Channel represents a communication line to a Server. Notice that
    // Channel is thread-safe and can be shared by all threads in your program.
    brpc::Channel channel;

    // Initialize the channel, NULL means using default options.
    brpc::ChannelOptions options;
    options.protocol = brpc::PROTOCOL_BAIDU_STD;
    options.connection_type = FLAGS_connection_type;
    options.timeout_ms = FLAGS_timeout_ms /*milliseconds*/;
    options.max_retry = FLAGS_max_retry;
    Auth a;
    options.auth = &a;
    if (channel.Init(FLAGS_server.c_str(), NULL) != 0)
    {
        LOG(ERROR) << "Fail to initialize channel";
        return -1;
    }

    // Normally, you should not call a Channel directly, but instead construct
    // a stub Service wrapping it. stub can be shared by all threads as well.
    example::EchoService_Stub stub(&channel);
    brpc::Controller cntl;
    brpc::StreamId stream;
    brpc::StreamOptions stream_options;
    stream_options.handler = &_receiver;
    if (brpc::StreamCreate(&stream, cntl, &stream_options) != 0)
    {
        LOG(ERROR) << "Fail to create stream";
        return -1;
    }
    LOG(INFO) << "Created Stream=" << stream;
    example::EchoRequest request;
    example::EchoResponse response;
    request.set_message("I'm a RPC to connect stream");
    stub.Echo(&cntl, &request, &response, NULL);
    response.PrintDebugString();
    if (cntl.Failed())
    {
        LOG(ERROR) << "Fail to connect stream, " << cntl.ErrorText();
        return -1;
    }
    int cnt = 0;
    while (!brpc::IsAskedToQuit())
    {
        butil::IOBuf msg1;
        msg1.append("hi");

        ++cnt;
        if (cnt < 3)
            CHECK_EQ(0, brpc::StreamWrite(stream, msg1));
        if (cnt == 3)
            brpc::StreamClose(stream);
        if (cnt == 4)
            CHECK_EQ(0, brpc::StreamWrite(stream, msg1));
        if (cnt > 4)
            break;
        // butil::IOBuf msg2;
        //msg2.append("0123456789");
        //CHECK_EQ(0, brpc::StreamWrite(stream, msg2));
        sleep(1);
    }

    // CHECK_EQ(0, brpc::StreamClose(stream));
    LOG(INFO) << "EchoClient is going to quit";
    return 0;
}
